This space is too big for just on.600 imo. I would go with the 4 leds idea. Vipar does packs of multiple lights on eBay for good deal. But you're only going to get 1 to 3 feet of penetration depending on the wattage of your led bulbs as well as the total wattage of each light.I'm starting with a 6 ft long. 6 ft in depth and 6 ft high. I was thinking of getting Four 150 watt leds. ATM I'm leaning towards one 600 watt hps.
Have you read any of the forum? Over the last 6 months or so, this forum has produced at least 100 rotations or so, from about 65-75 different users, most top shelf. Running the gamut too...... from Chinese LED's with plastic casing Grow lights, to "more efficient than HPS", Diy grows. Time to read up.I'm liking the concept of led but there is not a lot of supporting info. Benefits I know of ATM just comes to heat. Led COULD save you money in the long run with bulb replacement. Some advice would be nice